diff options
Diffstat (limited to 'sys/arch/powerpc/ddb/db_memrw.c')
| -rw-r--r-- | sys/arch/powerpc/ddb/db_memrw.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/sys/arch/powerpc/ddb/db_memrw.c b/sys/arch/powerpc/ddb/db_memrw.c new file mode 100644 index 00000000000..7078e7f6b3b --- /dev/null +++ b/sys/arch/powerpc/ddb/db_memrw.c @@ -0,0 +1,113 @@ +/* $NetBSD: db_memrw.c,v 1.4 2001/05/18 20:38:27 matt Exp $ */ +/* $OpenBSD: db_memrw.c,v 1.1 2002/06/08 16:02:14 miod Exp $ */ + +/* + * Mach Operating System + * Copyright (c) 1992 Carnegie Mellon University + * All Rights Reserved. + * + * Permission to use, copy, modify and distribute this software and its + * documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR + * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie Mellon + * the rights to redistribute these changes. + */ + +/* + * Interface to the debugger for virtual memory read/write. + * This is a simple version for kernels with writable text. + * For an example of read-only kernel text, see the file: + * sys/arch/sun3/sun3/db_memrw.c + * + * ALERT! If you want to access device registers with a + * specific size, then the read/write functions have to + * make sure to do the correct sized pointer access. + */ + +#include <sys/param.h> +#include <sys/proc.h> +#include <sys/systm.h> + +#include <uvm/uvm_extern.h> + +#include <machine/db_machdep.h> +#include <machine/pcb.h> + +#include <ddb/db_access.h> + +/* + * Read bytes from kernel address space for debugger. + */ +void +db_read_bytes(addr, size, data) + vaddr_t addr; + register size_t size; + register char *data; +{ + register char *src = (char *)addr; + faultbuf env; + faultbuf *old_onfault = curpcb->pcb_onfault; + if (setfault(env)) { + curpcb->pcb_onfault = old_onfault; + return; + } + + if (size == 4) { + *((int *)data) = *((int *)src); + } else if (size == 2) { + *((short *)data) = *((short *)src); + } else { + while (size > 0) { + --size; + *data++ = *src++; + } + } + curpcb->pcb_onfault = old_onfault; +} + +/* + * Write bytes to kernel address space for debugger. + */ +void +db_write_bytes(addr, size, data) + vaddr_t addr; + register size_t size; + register char *data; +{ + register char *dst = (char *)addr; + faultbuf env; + faultbuf *old_onfault = curpcb->pcb_onfault; + + if (setfault(env)) { + curpcb->pcb_onfault = old_onfault; + return; + } + + if (size == 4) { + *((int *)dst) = *((int *)data); + } else if (size == 2) { + *((short *)dst) = *((short *)data); + } else { + while (size > 0) { + --size; + *dst++ = *data++; + } + } + syncicache((void *)addr, size); + curpcb->pcb_onfault = old_onfault; +} + |